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Vitaly Kuznetsov 773e8a0425 x86/kvm: use Enlightened VMCS when running on Hyper-V

Enlightened VMCS is just a structure in memory, the main benefit
besides avoiding somewhat slower VMREAD/VMWRITE is using clean field
mask: we tell the underlying hypervisor which fields were modified
since VMEXIT so there's no need to inspect them all.

Tight CPUID loop test shows significant speedup:
Before: 18890 cycles
After: 8304 cycles

Static key is being used to avoid performance penalty for non-Hyper-V
deployments.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>

2018-03-28 22:47:06 +02:00

alpha

…

arc

ARC fixes for 4.16-rc4

2018-03-01 14:32:23 -08:00

arm

KVM/ARM updates for v4.17

2018-03-28 16:09:09 +02:00

arm64

KVM/ARM updates for v4.17

2018-03-28 16:09:09 +02:00